1. Heat broiler with rack set 4 inches from heat. Place shrimp on a large broilerproof rimmed baking sheet.
2. Sprinkle with oil and garlic, and season generously with salt and pepper; toss to coat. Arrange shrimp in a single layer.
3. Broil until opaque throughout, 3 to 4 minutes. Sprinkle with lemon juice and parsley; toss to combine. Serve immediately; garnish with lemon wedges.